/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-web-praise nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sri.ai.lpitools.gwtgui.client.components.tex;

import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Image;

/**
 * This is the GWT Client Side Class for rendering LaTeX strings as images.
 * 
 * Minor modifications must be made to the web.xml file for the project.
 * The TeX Servlet must be mapped to be run as a servlet.
 * Instructions for setting up the servlet are found in the TeXServlet Javadoc.
 * 
 * @author dabraham
 *
 */
public class TeXClient {
	
	/**
	 * Returns an Image pointing to the rendered TeX string.
	 * @param input The TeX to be rendered.
	 * @return An Image of the rendered TeX.
	 */
	public static Image getTeXImage(String input) {
		String escapedInput = URL.encode(input).replace("+", "%2B");
		String myURL = Window.Location.getHost();
		String protocol = Window.Location.getProtocol();
		String path = Window.Location.getPath().substring(0, Window.Location.getPath().lastIndexOf('/'));
		String address = protocol + "//" + myURL + path + "/TeX?TeX="+ escapedInput + "&AltTex="; 

		return new Image(address);
	}
	
}
